Even if your job responsibility is only on the web front end (browser-side development in HTML, CSS, and JavaScript), there may be times where your web pages must interact with a web application. For example, your web pages may need to include instructions to pull dynamic (server-generated) content into the web page. Links that you create may need to include queries for special content. Furthermore, you may need to create web forms that will send data to a server for processing or collection.

JavaScript enables you to perform a wide variety of complex tasks directly in the web browser, which can make web pages more interactive and dynamic, and can help reduce the number of communications needed with the web server, making web applications faster and more responsive.

Tasks like form validation involve working with multiple elements. JavaScript provides various techniques that enable you to conveniently iterate through a set of related elements, such as all the web forms in a page, or all the controls in a form.

Many web developers throughout the world have gone before you. They have solved problems as they worked in HTML, CSS, and JavaScript, and developed their own tools, templates, and reusable code to make their web development projects faster, more consistent, and less problematic. Though "the struggle" to solve problems and perfect your trade leads to knowledge and expertise, there's often little point in reinventing the wheel. This lesson introduces various open source web development templates, tools, and reusable code that you should investigate.

You'll wrap things up and then validate what you've learned in this course by taking an assessment.